EP2264961A1 - Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same - Google Patents

Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same Download PDF

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Publication number
EP2264961A1
EP2264961A1 EP09368020A EP09368020A EP2264961A1 EP 2264961 A1 EP2264961 A1 EP 2264961A1 EP 09368020 A EP09368020 A EP 09368020A EP 09368020 A EP09368020 A EP 09368020A EP 2264961 A1 EP2264961 A1 EP 2264961A1
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EP
European Patent Office
Prior art keywords
carriers
channel estimation
sub
pss
samples
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09368020A
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German (de)
English (en)
French (fr)
Inventor
Issam Toufik
Andrea Ancora
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STMicroelectronics Grand Ouest SAS
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ST NXP Wireless France SAS
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Filing date
Publication date
Application filed by ST NXP Wireless France SAS filed Critical ST NXP Wireless France SAS
Priority to EP09368020A priority Critical patent/EP2264961A1/en
Priority to CN2010800274957A priority patent/CN102461102A/zh
Priority to JP2012515397A priority patent/JP5661753B2/ja
Priority to US13/379,155 priority patent/US8804863B2/en
Priority to PCT/EP2010/003679 priority patent/WO2010145832A1/en
Publication of EP2264961A1 publication Critical patent/EP2264961A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H04L25/0244—Channel estimation channel estimation algorithms using matrix methods with inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/025—Channel estimation channel estimation algorithms using least-mean-square [LMS] method
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0256—Channel estimation using minimum mean square error criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H04L25/0216—Channel estimation of impulse response with estimation of channel length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the invention relates to the field of wireless communication and more particularly to a process for estimating the channel based on the PSS signal in a LTE communication network, and a receiver for doing the same.
  • Digital wireless communications are being widely used throughout the world particularly with the latest development of the Orthogonal Frequency Division Multiplex (OFDM systems) and the last evolution, namely the so-called Long Term Evolution (LTE) systems.
  • OFDM Orthogonal Frequency Division Multiplex
  • LTE Long Term Evolution
  • a User Equipment When a User Equipment (UE) wishes to access an LTE network, it must initiate a cell search procedure consisting of a series of synchronization steps by which the UE determines time and frequency parameters particularly necessary for the purpose of demodulating the downlink and also for getting critical system parameters.
  • UE User Equipment
  • the cell search procedure is based on the use of two particular synchronization signals being broadcast in each cell, namely the so-called Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • the synchronization signals are sequences of length 62 which are mapped to the central 62 sub-carriers (not including the d.c.) independently of the transmission bandwidth, as illustrated in Figure 1 .
  • the largest unit of time is the 10ms radio frame, which is subdivided into ten 1 ms subframes, each of which being split into two 0.5 ms slots.
  • Each slot comprises six to seven OFDM symbols in accordance with the length of the cyclic prefix.
  • resources are grouped in units of 12 subcarriers and each block of 12 subcarriers, during one slot, is called a Resource Block (RB), the latter being divided into Resources Elements (RE) which lasts for one OFDM symbol.
  • RB Resource Block
  • RE Resources Elements
  • Figure 2 recalls the general structure of the LTE sub-frame comprising both the broadcasted PSS and SSS signals.
  • the UE in order to synchronize, the UE has first to detect the PSS, which detection is then used for the purpose of the decoding of the SSS which provides the identification of the cell, such subsequent extraction being further required for the purpose of the decoding of the pilots or Reference Signals necessary for getting critical system parameters and also for achieving an accurate estimation of the channel.
  • Such channel estimation is highly desirable since it significantly improves the efficiency of the subsequent synchronization phases;
  • the knowledge of the channel allows the designer the possibility to consider coherent SSS detection methods which are known to be more efficient.
  • PSS Primary Synchronization Channel
  • MMSE Minimum Mean Square Error
  • LTE Long Term Evolution
  • LS Least Square
  • the d.c. sub-carrier is interpolated by averaging the two neighboring sub-carriers..
  • the missing subcarrier -32 is interpolated by means of subcarrier # -31.
  • the method involves the steps:
  • F L is the 64 ⁇ L matrix, obtained by selecting the first L columns of the N ⁇ N DFT or FFT matrix, ⁇ 2 is the noise variance and C h is the channel time domain impulse response covariance matrix.
  • the method involves the steps:
  • the method involves the steps of:
  • the method may involve the steps of :
  • the method involves the steps of:
  • the method involves the steps of:
  • the invention also provides a Receiver for a LTE digital communication network comprising means for extracting a Primary Synchronization Signal (PSS) from a received signal and further involving means for spanning said PSS on the 64 sub-carriers so as to facilitate the channel estimation.
  • PSS Primary Synchronization Signal
  • LTE Long Term Evolution
  • the OFDM modulation is widely spread in many existing standards (such as DAB, DVB-T, WiMAX, IEEE 802.16, ADSL, WLAN IEEE 802.11a/g, etc..) and expected to be used in many future developing standards.
  • the OFDM converts a broadband frequency-selective channel into a multiplicity of parallel narrow-band single channels.
  • guard interval syn-called Cyclic Prefix CP
  • Such guard interval is assumed to be temporally long enough to compensate for jitter, i.e. the variation of the delays experienced by the transmitted OFDM symbols through the channel. This prevents the appearance of inter-symbol interference (ISI).
  • ISI inter-symbol interference
  • M is the ZC sequence root.
  • Three different PSS identities i.e. ZC sequence roots
  • the Primary Synchronization Signals sequence mapping to sub-carriers is particularly illustrated in figure 3 .
  • the transmitted PSS sequence can be detected by performing a correlation of the received signal against the three possible PSS sequences and by detecting the correlation peak.
  • the detection of the sequence identity and time location allows the OFDM symbol synchronization and the cell ID decoding.
  • the PSS can be used as a pilot sequence allowing channel estimation that can be used for the SSS detection. This is made possible by the fact that the SSS and PSS are mapped both to the (same) central sub-carriers, and that the OFDM symbols containing the PSS and the SSS are consecutive as shown in figure 2 .
  • Y be the vector of length 62 of the received signal in the 62 sub-carriers corresponding to the PSS.
  • F p is the 62 ⁇ L matrix, obtained by selecting the rows corresponding to the PSS positions and the first L columns of the 64 ⁇ 64 Discrete Fourier Transform (DFT) matrix.
  • F L is the matrix which is obtained by selecting the first L columns of the 64 ⁇ 64 DFT matrix, and ⁇ 2 being the noise variance;
  • C h being the channel time domain impulse response covariance matrix.
  • the MMSE estimator shows a significant complexity due to the two following grounds:
  • the inventors have designed a new and advantageous method which allows, with a low level of complexity, to generate an MMSE estimation of the channel on the sole basis of the PSS signal.
  • the method involves LS channel estimation on the 62 sub-carriers containing the PSS.
  • ⁇ LS denotes the estimated vector .
  • the method involves an interpolation based on reconstructing the LS channel estimation in the two missing sub-carriers (namely sub-carriers #-32 and d.c.) so that ⁇ LS shows to be spanning the 64 central sub-carriers, which is a condition for a significant reduction in the complexity of the MMSE (Minimum Mean Square Error) estimation.
  • MMSE Minimum Mean Square Error
  • step 41 for the purpose of performing such reconstruction.
  • this can be achieved by any appropriate function (for example a linear combination) of the channel estimation in the adjacent sub-carriers.
  • the channel estimation in the d.c. sub-carrier is made by averaging the two neighboring sub-carriers (i.e. neighbor in the left and neighbor in the right with respect to the central d.c. position).
  • the channel estimation in the sub-carrier at the edge is set equal to the channel estimation in the adjacent sub-carrier (i.e. sub-carrier -31).
  • the method involves the following steps:
  • step 44 - which requires the inversion of a matrix - is very simple to carry out since the matrix shows to be diagonal and, furthermore, of a size LxL.
  • the interpolation step 41 shows to be very advantageous since it allows to significantly reduce the level of the complexity of the MMSE channel estimation.
  • Figures 5-10 shows different embodiments corresponding to some situations where the knowledge of C h , ⁇ 2 or L is presumed to be not known. In such case, the following approximations can be made.
  • the method comprises the following steps :
  • the method achieves the channel estimation as follows :
  • Figure 10 illustrates a seventh embodiment of a channel estimation involving the steps of :
  • Such method clearly allows an effective channel estimation at the very early stage of the synchronization procedure, namely during the extraction of the PSS, without requiring great amount of digital resources.
  • Such channel estimation can then be used for subsequent operations, e.g. for the detection of the SSS.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
EP09368020A 2009-06-19 2009-06-19 Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same Withdrawn EP2264961A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09368020A EP2264961A1 (en) 2009-06-19 2009-06-19 Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same
CN2010800274957A CN102461102A (zh) 2009-06-19 2010-06-18 Lte通信网络中根据pss信号的信道估计过程及其接收器
JP2012515397A JP5661753B2 (ja) 2009-06-19 2010-06-18 Ｌｔｅ通信ネットワークにおけるｐｓｓ信号からチャネルを推定するプロセス、およびそのレシーバ
US13/379,155 US8804863B2 (en) 2009-06-19 2010-06-18 Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same
PCT/EP2010/003679 WO2010145832A1 (en) 2009-06-19 2010-06-18 Process for estimating the channel from the pss signal in a lte communication network, and receiver for the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09368020A EP2264961A1 (en) 2009-06-19 2009-06-19 Process for estimating the channel from the PSS signal in a LTE communication network, and receiver for the same

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EP2264961A1 true EP2264961A1 (en) 2010-12-22

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EP (1) EP2264961A1 (zh)
JP (1) JP5661753B2 (zh)
CN (1) CN102461102A (zh)
WO (1) WO2010145832A1 (zh)

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CN103379059A (zh) * 2012-04-23 2013-10-30 马维尔国际有限公司 Mmse的信道估计方法和装置
CN103491041A (zh) * 2012-06-13 2014-01-01 华为技术有限公司 同步方法及基站、终端
KR101405150B1 (ko) * 2013-02-08 2014-06-13 중앙대학교 산학협력단 자도프 추 시퀀스의 특성을 이용한 다중 반송 주파수 옵셋 추정 방법 및 장치
CN106160969A (zh) * 2015-04-01 2016-11-23 南京中兴群力信息科技有限公司 一种lte下行同步数据发射配置与接收方法

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US9313063B1 (en) * 2015-01-30 2016-04-12 Huawei Technologies Co., Ltd. Apparatus and method for transmitting data with conditional zero padding
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US10581548B2 (en) 2015-12-24 2020-03-03 Lg Electronics Inc. Method and apparatus for transmitting primary synchronization signal in wireless access system
CN110073616B (zh) * 2017-01-09 2022-03-29 苹果公司 同步信号发送和接收

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103379059A (zh) * 2012-04-23 2013-10-30 马维尔国际有限公司 Mmse的信道估计方法和装置
CN103379059B (zh) * 2012-04-23 2018-09-14 马维尔国际有限公司 Mmse的信道估计方法和装置
CN103491041A (zh) * 2012-06-13 2014-01-01 华为技术有限公司 同步方法及基站、终端
CN103491041B (zh) * 2012-06-13 2017-04-12 华为技术有限公司 同步方法及基站、终端
KR101405150B1 (ko) * 2013-02-08 2014-06-13 중앙대학교 산학협력단 자도프 추 시퀀스의 특성을 이용한 다중 반송 주파수 옵셋 추정 방법 및 장치
CN106160969A (zh) * 2015-04-01 2016-11-23 南京中兴群力信息科技有限公司 一种lte下行同步数据发射配置与接收方法
CN106160969B (zh) * 2015-04-01 2019-04-16 南京扬舟信息科技有限公司 一种lte下行同步数据发射配置与接收方法

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US8804863B2 (en) 2014-08-12
US20120163503A1 (en) 2012-06-28
JP5661753B2 (ja) 2015-01-28
CN102461102A (zh) 2012-05-16
JP2012530435A (ja) 2012-11-29
WO2010145832A1 (en) 2010-12-23

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